Research activities of ONERA on laminar airfoils in the framework of JTI Clean Sky SFWA-ITD: transition control

International audience; The present paper deals with recent research activities carried out in ONERA regarding laminar/ turbulent transition control within JTI Clean Sky SFWA-ITD (Smart Fixed Wing Aircraft Integrated Technology Demonstrator). Two main topics are investigated here: the first one is the control of the attachment line transition using both passive and active devices, ie either an optimized Anti Contamination Device or wall suction through perforated panels. The second topic is the control of a cross-flow transition process using a passive device made of micronsized roughness elements.